Electromagnetic Induction Test

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Electromagnetic Induction Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The phenomenon of generation of current or emf by varying the magnetic field is known as _________.

A
electric induction

B
magnetic induction

C
electromagnetic induction

D
none of the above

Solution

The phenomenon in which electric current is generated by varying magnetic fields is appropriately called electromagnetic induction. A voltage, and in turn current can be produced in a coil when these coils are rotated in magnetic field. The process of generating current in a current loop is called EMI (Electromagnetic Induction).
Question 2
1 / -0

A long straight current carrying wire (B is the magnetic field) passes normally through the center of circular loop of area A. If the current through the wire increases, the value of induced emf in the loop is equal to,

A
BA

B
2 BA

C
zero

D
BA/2

Solution

The flux created by straight current carrying wire is depicted in the figure

Induced EMF is equal to the change in the flux.

Therefore, we can write

e = ϕ₁ – ϕ₂

Flux (ϕ) = B.A = B A cos θ

But, here the B is perpendicular to the area of cross-section of the loop.

Thus θ = 90 °

Therefore, even though the magnetic field produced by the wire is increasing the change in flux will be nevertheless zero.
Question 3
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The term magnetic flux is defined as the;

A
total number of magnetic field lines crossing through any surface normally

B
the dot product of magnetic field and the area of cross-section, B A

C
the total magnetic field per unit area, B/A

D
both A and B

Solution

The total number of the magnetic field lines crossing through any surface normally, when it is placed in a uniform magnetic field is known as the magnetic flux of that surface.

Magnetic flux through a plane of area A placed in a uniform magnetic field B can

be written as

Φ_B = B.A = BA cos θ

where θ is angle between B and A

The SI unit of magnetic flux is weber (Wb) or tesla meter squared (Tm²). Magnetic flux is a scalar quantity.
Question 4
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Which of the following ways can be used to change the value of magnetic field;

A
if the magnetic field in which the loop is placed is either increasing or decreasing.

B
if the shape of the conducting loop is changed (by either compressing or by stretching)

C
if the orientation of the conducting loop in the magnetic field is varied. (θ is varied)

D
All of the above.

Solution

The magnetic flux is given by the equation,

Φ_B = B.A = BA cos θ

where θ is angle between B and A

Clearly form the above equation we can say that the flux can be varied by changing the value of any of the parameter B, A and θ
Question 5
1 / -0

The lines of magnetic flux which are parallel and in the same direction __________ each other.

A
Attract

B
Repel

C
Intersect

D
Cancel

Solution

Lines of magnetic flux which are parallel to each other and in the same direction repel each other because they tend to act as like poles and like poles repel each other.